Innoshima(因島市,Innoshima-shi) was a city in Hiroshima Prefecture, Japan. The city was founded on May 1, 1953.

As of 2003, the city had an estimated population of 27,465 and a population density of 690.77 persons per km. The total area was 39.76 km².

On January 10, 2006, Innoshima, along with the town of Setoda (from Toyota District), was merged into the expanded city of Onomichi.